34 21 200 Removing and installing/replacing brake pads on both rear disc brakes (Brembo)
Special tools required:
- 34 1 000
- 34 1 050
- 34 1 280
- 2 352 960
Attention!
- Brake pad wear sensor: After removal it must be replaced (brake pad wear sensor loses its retention capability in the break pad).
- Retaining pins and expanding spring: for vehicles older than 48 months it is recommended to replace the retaining spring!
So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces for the brake pads on the brake caliper mounting bracket, but rather clean with brake cleaner BMW part number: 83 19 2 154 780 and thinly coat with brake pad paste BMW part number 83 19 2 158 851 (3 gr.) or 83 19 2 158 852 (100 gr.).
Spread brake pad paste onto the marked surfaces using a brush!
Observe information regarding the APPLICATION OF BRAKE PAD PASTE TO BRAKE PADS AND BRAKE ANCHOR PLATES .
Necessary preliminary work:
- Only remove WHEELS
using a suitable wheel lift type jack / wheel fitting lever!
Failure to comply with this stipulation may cause damage to the wheel rim or brake caliper
- Remove BRAKE PAD WEAR SENSOR
Drive out retaining pins (1).
Remove expanding spring (2).
Pull out brake pads (3) with special tool 34 1 000.
Attention!
Mark any worn brake pads.
In the event of one-sided brake pad wear, do not change brake pads round.
Clean brake pads.
Do not grease backs of brake pads sleeve.
Attention!
When pressing down piston, note brake fluid level in expansion tank.
Overflowing brake fluid will damage the paintwork.
Turn piston back fully with special tool 2 352 960.
Check minimum brake disc thickness:
- Position special tool 34 1 280 at three measuring points in area (1) and measure.
- Compare measuring result and lowest value with setpoint value.
Attention!
New brake pads may only be installed if the brake disc thickness is greater than the minimum brake disc thickness.
Attention!
If new brake pads are mounted on a brake disc, the following must be observed:
- Bevel edges in the area (1) slightly (dimension A must not exceed maximum 1 mm).
These procedures applies for all the following described brake systems.
Check dust boot for damage and replace if necessary.
Clean contact surface (1) of brake pistons with brake cleaner.
So as not to damage the surface coating, if possible do not mechanically clean the guide surfaces (2) for the brake pads on the brake caliper mounting bracket. Clean guide surface (2) with brake cleaner and apply a thin coating of brake pad paste.
Clean both inner and outer guide surfaces (2) and apply a thin coating of brake pad paste.
In case of bonded brake pads, no brake pad paste may be applied to the contact surface!
Thinly coat contact surface in the area (2) on both sides with thin brake pad paste.
Lightly coat the brake pad contact surface on both sides in area (1) with brake pad paste.
Installation note:
Apply an adhesive layer to new brake pads!
Remove the protective film (1) of the adhesive layer from the brake pads.
The adhesive layer must not be touched!
During installation in the brake caliper, the adhesive layer must not touch the brake piston!
Attention!
The brake pads must be bonded with the brake caliper immediately following the installation!
Step on the brake pedal to the floor and hold the pressure for one minute. This causes the brake pads to adhere to the brake pistons.
- Fully depress brake pedal several times so that brake pads contact brake discs.
- When installing new brake pads at front and rear axles, the brake fluid level must be brought up to the "maximum" mark.
- Read and comply with notes on BREAKING IN NEW BRAKE DISCS/BRAKE PADS .
- When exchanging brake pads, reset CBS display in accordance with factory specification.